Falcon spline pinions too tight?

Today my team recieved our Falcon 500s along with spline bore pinions, and we are excited to try them. However, while we expected the motor pinions to slide right on, we found that only one of the pinions we bought could be installed easily. The other pinions seemed to be press fit, and couldn’t be installed without a large amount of force. Has anyone else also encountered this issue? And are there any possible solutions other than forcing the pinions on?

Thanks a lot!

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